Regulation of carbon partitioning into carotenes by MPTA, a substituted tertiary amine

Conference · Tue Apr 01 00:00:00 EST 1986 · Plant Physiol., Suppl.; (United States)

OSTI ID:5096176

Madhavan, S; Rosenfield, C L; Benedict, C R

In mature citrus fruits, synthesis and turnover of carotenes appears to be low. Treatment of lemon pieces with the substituted tertiary amine, 2-(4-methylphenoxyl)triethylamine, MPTA, induces the synthesis of carotenes. Exposure of tissue slices (lemon flavedo) to MPTA for 72 hrs results in the production of 29.6 ..mu..g gfrwt/sup -1/ lycopene whereas control slices showed only trace amounts of lycopene. An identical incorporation of /sup 14/C-glucose into sugars, amino acids and organic acids, in both treated and control tissue slices indicates the non-disturbance of fruit respiration by MPTA treatment. Incorporation of /sup 14/C-glucose into carotenes is negligible in mature citrus fruits, but in MPTA treated tissue slices there is a pronounced incorporation of /sup 14/C-glucose into carotenes. MPTA treatment induces the synthesis of carotene enzymes, thus effecting an increased partitioning of glucose into the MVA pathway for carotene synthesis.

• Research Organization: Texas A and M Univ., College Station
• OSTI ID: 5096176
• Journal Information: Plant Physiol., Suppl.; (United States), Vol. 80:4; Conference: Annual meeting of the American Society of Plant Physiologists, Baton Rouge, LA, USA, 8-12 Jun 1986
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
AMINES
BIOLOGICAL EFFECTS
CAROTENOIDS
BIOSYNTHESIS
BIOLOGICAL PATHWAYS
CARBON 14 COMPOUNDS
CITRUS
ENZYMES
GLUCOSE
LABELLING
ALDEHYDES
CARBOHYDRATES
HEXOSES
HYDROCARBONS
LABELLED COMPOUNDS
MONOSACCHARIDES
ORGANIC COMPOUNDS
PIGMENTS
PLANTS
SACCHARIDES
SYNTHESIS
TERPENES
550201* - Biochemistry- Tracer Techniques